vsphere 2x cluster DNS advice

Hello,

We have two vmware esx 5.x cluster's: one for internal company and one for customers.
Both are located on our internal network and separated by routers/firewalls.

 Currently we did not have any dns in the customer cluster and only used ip.

Now i read it is really advised to have DNS and I am at the process of installing a new vCenter server. I seems I have to options:

use dns in network segment 1 and open firewalls/routers (2x) so that cluster 2 will be able to resolve with DNS.

or

install second DNS server in cluster 2
use dns forwarding for new DNS domein:    nameproduction.company.nl
vm's and hosts will be:    host1.nameproduction.company.nl

I am in doubt what is best to do: If I open up firewall for option 1: could heavy traffic etc cause problems with failure situations of vcenter/vmware hosts etc ? Or wouldn't it be a problem ?

Any other tips?
ict ictAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, important to hive DNS working correctly.

We usually have a single DNS for our DNS Domain using Active Directory to aid DNS replication across Domain Controllers.

We have at least three DCs, with two DNS servers, referenced by servers and clients.

Open up the firewall for DNS requests, it's low traffic.
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